Abstract: The paper focuses on the site grading design for the food waste management company ( proposed) in a city． Matlab software is used to optimize the terraced site grading design． Firstly，contour method is used to calculate the excavation and filling of each step to get the datum by AutoCAD． On the basis of it，Matlab software were used to fit the functions between the design elevation and earthwork volume of each step，and solve the equations set under the constraint conditions． Then get the optimal design elevations and the minimum earthwork quantity based on the balance of excavation and filling，to provide the optimized design of the general horizontal layout． This method can offer the reference to analysis and design the general layout of industrial enterprises terraced field．